Remove WebContents::HasManifest.

content/browser/manifest/manifest_manager_host.h

Index: content/browser/manifest/manifest_manager_host.h
diff --git a/content/browser/manifest/manifest_manager_host.h b/content/browser/manifest/manifest_manager_host.h
index 810f525a46d170996d89483cffbe6dbfb5898ec3..ce593eccd514ad1fc8ad8f4b0ce55c38f03c9439 100644
--- a/content/browser/manifest/manifest_manager_host.h
+++ b/content/browser/manifest/manifest_manager_host.h
@@ -26,38 +26,27 @@ class ManifestManagerHost : public WebContentsObserver {
 
   using GetManifestCallback =
       base::Callback<void(const GURL&, const Manifest&)>;
-  using HasManifestCallback = base::Callback<void(bool)>;
 
   // Calls the given callback with the manifest associated with the
   // given RenderFrameHost. If the frame has no manifest or if getting it failed
   // the callback will have an empty manifest.
   void GetManifest(RenderFrameHost*, const GetManifestCallback&);
 
-  // Calls the given callback with a bool indicating whether or not the document
-  // associated with the given RenderFrameHost has a manifest.
-  void HasManifest(RenderFrameHost*, const HasManifestCallback&);
-
   // WebContentsObserver
   bool OnMessageReceived(const IPC::Message&, RenderFrameHost*) override;
   void RenderFrameDeleted(RenderFrameHost*) override;
 
  private:
   using GetCallbackMap = IDMap<GetManifestCallback, IDMapOwnPointer>;
-  using HasCallbackMap = IDMap<HasManifestCallback, IDMapOwnPointer>;
   using FrameGetCallbackMap = base::hash_map<RenderFrameHost*, GetCallbackMap*>;
-  using FrameHasCallbackMap = base::hash_map<RenderFrameHost*, HasCallbackMap*>;
 
   void OnRequestManifestResponse(
       RenderFrameHost*, int request_id, const GURL&, const Manifest&);
-  void OnHasManifestResponse(
-      RenderFrameHost*, int request_id, bool);
 
   // Returns the CallbackMap associated with the given RenderFrameHost, or null.
   GetCallbackMap* GetCallbackMapForFrame(RenderFrameHost*);
-  HasCallbackMap* HasCallbackMapForFrame(RenderFrameHost*);
 
   FrameGetCallbackMap pending_get_callbacks_;
-  FrameHasCallbackMap pending_has_callbacks_;
 
   DISALLOW_COPY_AND_ASSIGN(ManifestManagerHost);
 };